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If its a Samsung HCN653W (or similar model), the first thing to try is the menu option named "Magic Focus", which tunes the set's focus.

Otherwise, it sounds like a job for
a convergence. Perform a convergence procedure on your TV, and if the
problem recurs within a few days/weeks, then your TV's 'convergence
amplifier' board (aka "convergence amp board") is starting to fail.This board may fail completely, in which case, your convergence procedure will fail to improve the picture.A "convergence procedure" can be performed entirely by just using the appropriate setup menu option and your remote control.This
board may partially fail, in which case your convergence procedure will
properly converge the Red, Blue, Green colors on just part of the
screen, whereas a properly functioning convergence amp board will allow
complete convergence of the colors across the entire screen.Your TV's convergence procedure instructions will be found in your TV's Owners Manual.At
least one Projection TV manufacturer recommends that the consumer
perform a convergence procedure every 30 days, but most TV owners find
that excessive, and might only do one when (a) there's an evident color
convergence problem in any part of the picture, or (b) once every 3-6
months.How-to video: www.youtube.com/watch?v=esk4nYZKFcghow-to instructions: www.ehow.com/how_2034880_perform-convergence--tv.html

cost to you: $zero.

If the convergence amp board is bad, cost for a service call would be $300 (USD) plus $100 for a new board plus 50% markup on parts = about $450 (USD)Cost to order a new board online: about $100 (USD) + shipping + sales tax.Alternatively,
if you can solder/desolder STK's (Power Amplifier Integrated Circuits),
one can repair a convergence amp board for as little as $30 (USD) or so.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony,Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit wiith instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms

Screen Looks 3-D

Colors wont align

Screen may look distorted or warped

No Audio/Video - makes a chirping sound.

Problem #2

Another common problem is dull or washed out video.
Your TV may have one or more of the following symptoms....

Ur tv convergence is dead.Must know how to solders?Buy a convergence kit at Tv Repair World.com,Tvrepairkits.com to replaced the convergence ICS and all it resistors.The shop will cost u $300 parts and labors.

if the option for convergence is still listed under the setting section of the on screen menu, then you need a convergence power supply board. If the convergence option is missing from the menu you need the ITC222 convergence missing repair kit. You can get either one at the following link they include instructions for the repair.http://www.tvrepairworld.com/

Here are some of the most common symptoms and example photos of a convergence problem

Screen looks 3D

Colors don't line up

One or more colors can't be adjusted when using the convergence menu.

Screen is bowed or warped.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

Solution

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

The colors weren't lining up correctly on my HC-P4752W which is only about 30 months old. I did a little bit of research and got ahold of the people at http://servicemanuals.vstore.ca/ They recommended replacing the IC's as well as the IC resistors. I purchased the replacement parts from their site and made the repairs myself. I should mention that I didn't have any previous soldering experience. The repair was easy and a complete success. You may find replacement parts elsewhere for slightly cheaper but what you won't find is the prompt and detailed customer service that they provide. They gave me there # and said to call if I had any questions before or during repair. I took advantage of their services and got answers every time I called.